Commutator-truing device.



F. G. LUDWIG.

GOMMUTATOR TRUING DEVICE.

APPLICATION FILED M-AY 31, 1913.

y f.; @ttor/iq@ Patented Oct. 21, 1913 UNITED 1 STATES PATENT oEEioE.

' uname e. nnnwraor LOCKPOET, ILLINOIS.

i GGMHUTATOReTB-UIN-G DEVICE.

Be it known that 1,--F3ANK G. LUWIG,-a citizen of the United States, and a .resident of the city of Lockport, county of Uill, and Stateof Illinois, have inventcdfcoltain new and useful Improvements in Commutator- Truing Devices, of which the :following is a specification.

My invention `relates 'to commntator tir- 114 ing devices and the object of this improvement fisto provide a simple and effective device of this character .which -is 'normally not in use.

means of resilient members and 'locked out of 4engagement with said commutator .when

'Other' objects will appearv hereinafter- The invention consistsin the combinations and arran ements ofy .parts hereinafter ,de-

scribed an claimed.

Specification of Letters Patent.

Applicationledlly 31, 19,13. era1'N0. 771,039.

-held in engagement with the commutator by .The invention willbe best understood by reference to the .accompanying drawing,

forming a part of this specification, and in which, y

Figure 1 lis a' vfragmental elevation of 'a motor .equipped with .my-improvement .which is shown'in section, Fig. 2 is a view of the' same taken on line 2-2 in Figfl, Fig. 3 is a side elevation of my improvement,` and Fig, 4 is an enlargedsection taken on line. 4-4 in Fig. 1.'

The preferred'formof construction as illusv trated in the accompanying drawingco'mprises a bracket 5 secured to a boss 6 onthe frame 7 of a motor, or the' like, by means of bolts 8, or their equivalent. vSecured ony the bracket 5 by means of a dove-tail connection is a base 9.- The base 9. is maintained in posi tion on bracket' by means of buttonsl-O. The buttons 1Q are provided so that the base 5 may be moved longitudinally from vits engagement with the bracket` when sode'- sired.' Pins 11 extend upwardly frornbase 9 land mounted on said pins 11 vail-abrasive holder 12. Between the base 9 and abrasive holder 12 on each ofthe. pins 11 is a compression spring 13 adapted to normally hold the abrasive holder inv engagement with the commutator '14 ofthe motor, or the like.

On the underside of the abrasive holder 12 is pivotally mounted'a locking lever 15, pivoted as at 16. ,l The end portions of lever `15 engage corresponding bevel surfaces 17 of perfor-ations 8 in plates 19, said plates 19 bel Patentamt-.21,1913

ingsecured base A9 andengaging. the sides of abrasive 'holder 12, substantially as indicated. The inclinedl surf-aces v17 are oppositely iinc'linedso that ythe lever 15 will al-y ways be in horizontal position, as will be readily understood. On the under-.sides of the 'abrasive holder 1'2 are provided leaf' springs 20 adapted to hold the edges of an abrasive Aelement 21, .such vas sand paper or f 'emery cloth. -The sand paper, or '.emery cloth is placed on the upper curved surface ofthe abna'sive element with its end'portionsl bent Iaround the edgesthereof andheld. un-

der the sprngsSZO. The abrasive element 21 may. .extend ,entirely across longitudinalilyl of the face of the abrasive holder 12, or may 'be .formed in a plurality of narrow .strips with theirends held under the springs 20.

In. operation, the device secured to the vframe Tof-a motor, ortho like, substantially as indicated, -andwhen the ,device isyto ,be

used the lever 15 is placed .in aposition, such as indicated in. Fig. 3,---thus allowing the springs 13 to hold the abrasive against the commutator 1 4. When the device is not use'the lever 15 is inovedj on its pivotal point vto 'substantially the position indicated by its dotted lines in Fig. 4, having moved over the inclined surfaces 17 of. the plates 19 thereby drawing the abrasive holder toward4 base 9, andupon leverl engaging the horizontal surfaces at the ends of the perforation 18, the. abrasive isl lockedvjin inoperative os'ition.A All Vthat is necessary to unlock t e device is to simply inove the lever-15 on its pivotal point. In use the brushes-'not showno'f the-motor may berel moved or raised `from the comn'mtator, or.

the device-may be used while the motor is in use. .lVhen the brushes are positionediso lthat -they would interfere with the device when'positioned `as shown, the ,device may be Ysecured to the frame by means. of any desire toavail'mysclf of such-variations ,and

10.( l ordinary tWorking of the brushes of the mo- I modifications es come Within tlie scope of the appended claims.

Having described my nim es neer sind desire to seeui'e by aient is: l

A comnmtzitoi truing device comprising a bise in iixed position; guides on said baise; nn abrasive holder mounted on said guides; fesilient elements between said sbrasive i'ioldei1 and said buse adapted to no1'- innlly liold seid abrasive holder in opeizitive position; and a. lock adapted to lock` seid abrasive holder in inoperative position, substantially as desoifibed. y g 2. A oomniutntoi t'iuing device ooinpiis-y l ing e. base in fixed position; guides on said l base; an abrasive lioldei mounted on seid guides; resilient elon'ients between seid zibrzil sive holder and seid base adapted to non mally bold said abrasive lioldei in opei" l tive position; pluies carried by said base und engaging seid abrasive holder, said plates being,l pi'ovided with perfo ations with inciined sides; and i locking leve-i pivoted on said abrasive holder, engiiging the inclinedA sides oi" the peifomtions in said plates and l invention what l o Letters iied by seid base vadapted to lock said abrasive holder in inoperative position7 substantially es described.

A ooininut ator tiuing device comprising e base in fixed position; vertical guide pins on said buse; iin abrasive holder' mounted on sri-id guide pins and adepted ioi vertical movement; e helical compression spring aroundy each guido pin between said base and said iibrzisive holdeinormally maintaining the latter in operative positions; plates carand engaging said aloasive holder, said plates being provided with perfoietions with inclined sides; and n locking leveil pivoted on said abissi-Ie holder, eninging the inclined sides of the peiiorations in seid plates and adapted to lock seid abrasive holder in inoperative position, substantially es described.

ln testimony whereof l have signed my neme to this speoiication in .the presence o two subscribing witnesses.

FRANK "Witnesses HAL H. GAINns,

il. RUSSELL.

G. LUDl/VIG. 

